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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-08-2010
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headers and underdrive pulley

do either make any noticeable difference at all on a 4.0 ohv? so far this motor is the least responsive to mods i have ever seen lol already tried the tuner route- wiped out my computer's memory- wasn't a cheap repair so not interested in going that route again.. have a jacobs ignition, and a volant intake and magnaflow exhaust in the works
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Old 01-08-2010
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I know I have said it here before, but intake and exhaust are things that usually net gains at high RPMs. The 4.0L OHV isn't a high revving engine at all so I don't think you'll see much improvement with those things. It will sound good though for sure.
A lot of people like the underdrive pulleys and electric fans, and they would decrease parasitic drag on the engine, but I don't like the idea behind underdrive pulleys (I'd rather my cooling and charging system work right) and most e-fan controllers end up crapping out.
Face it, you have a good reliable engine but it's not a power house. It makes good torque at low RPM.
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Old 01-08-2010
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in addition to what brian has said, the parasitic drag at low rpms is next to nothing... it's all percentages, say you reduce rpm of accessories by 10%, at 1000 rpm, you are only changing the rate by 100... not that much... but at 6000, your looking at 600 rpm, plus the drag multiplies exponentially at higher speeds, so from 1000 to say 3000 the drag may be doubled, but from 5500-5700, the drag may be AGAIN doubled, and it's only 1/4 of the difference in actual RPM, and percentage differences are the biggest...

either the underdrive pullies or the e-fan would make a difference, IMO, but on the other hand, i'm no expert, i've never put one on one of my own vehicles, so i have nothing to compare it to... i'll bet with the e-fan you would notice a difference in your gas mileage...

i would suggest the e-fan personally, just keep an eye on your temp gauge... if it starts going up, check the fan... but it's really no less reliable than the mechanical fan if you get a good one...
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Old 01-08-2010
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Wait for someone with a 4.0L OHV post imo most 4.0L SOHC guys that havent had OHV dont get these motors.

Brandon Redrocket his the headers idk about the pulleys
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Old 01-08-2010
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Quote:
Originally Posted by --weezl-- View Post
in addition to what brian has said, the parasitic drag at low rpms is next to nothing... it's all percentages, say you reduce rpm of accessories by 10%, at 1000 rpm, you are only changing the rate by 100... not that much... but at 6000, your looking at 600 rpm, plus the drag multiplies exponentially at higher speeds, so from 1000 to say 3000 the drag may be doubled, but from 5500-5700, the drag may be AGAIN doubled, and it's only 1/4 of the difference in actual RPM, and percentage differences are the biggest...
The OHV doesn't rev that high. At 4000RPM it didn't seem to make any power, just noise. It is pointless to rev that engine higher.
I have had two OHV 4.0s and one SOHC if that makes any difference to anyone. lol
I never tried a tuner with the OHV but I would imagine it would help. That is if it worked. Nobody made headers for my year of ranger when I had it so I don't know if they do much for that engine.
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Old 01-08-2010
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i believe a tuner would make a difference if ran higher octane fuel? everything else seems to make sense through, as i agree not a high rpm motor.. tried the throttle body as well but not 100% sure if actually made an improvement- it seems this motor works best stock- unless u change the cam, etc imo
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Old 01-08-2010
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ive got headman headers and a bounch of other stuff its all on my profile. the ohv is a great motor lots of low end torqure and ive made even more with the mods but she is still slow on top end lol. underdrive pulleys is a waist of money on thease motors.
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Old 01-08-2010
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Quote:
Originally Posted by brianjwilson View Post
The OHV doesn't rev that high. At 4000RPM it didn't seem to make any power, just noise. It is pointless to rev that engine higher.
I have had two OHV 4.0s and one SOHC if that makes any difference to anyone. lol
I never tried a tuner with the OHV but I would imagine it would help. That is if it worked. Nobody made headers for my year of ranger when I had it so I don't know if they do much for that engine.
fair enough, but at 4000 rpm, your still spinning your acc's the same as you would if you were only doing 3600 (provided your u/d kit is 10%)

i don't think they would make a significant difference for the... ?$200 they cost?

i know in racing, and in my mustang (and the other fox bodied people i talked to) mods, were classed in under 10/100 ratio, and over, for every $100 you throw in, you wanted 10 hp out of it... which is about the smallest amount noticeable...

*edit* something else i thought i would point out about clutched fans (stock on 90% of vehicles) they are a dual system clutch, first, the clutch only grabs when it gets hot enough, so it works as a thermal clutch, second, it disengages, regardless of how hot it is, if the motor spins faster than 3000 rpm i think it is... the clutch is attached to the fan, so once you hit 3000 rpm, your fan is spinning as fast as it's going to spin, if you spin the motor faster, the clutch starts slipping, but it won't slow down past that speed, as it will automaticly grab, so it does a grab/slip act... this is what it's designed for... so it won't make a huge difference again... although spinning a fan that big, that speed, will take a lot of work...
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Old 01-09-2010
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so am assuming alot better decision to spend the $$ on headers instead of underdrive pulleys? wish jba headers were more affordable..not worth the 500-600 for them imo.. pretty much leaves pacesetter ( only other brand i have seen for a 2000 4.0 ohv)
off subject, but how do u like the 400 big bore? always thought of doing that when i had my banshee
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Old 01-09-2010
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i think underdrive pullies will make a bigger difference in power, than the headers... and they are probably less money... but we aren't talking like a 20% gain of power here, i'm thinking maybe 5% which you probably won't really even feel... it will be marginal...
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Old 01-09-2010
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Originally Posted by ringer4x4 View Post
so am assuming alot better decision to spend the $$ on headers instead of underdrive pulleys? wish jba headers were more affordable..not worth the 500-600 for them imo.. pretty much leaves pacesetter ( only other brand i have seen for a 2000 4.0 ohv)
off subject, but how do u like the 400 big bore? always thought of doing that when i had my banshee
you can use the headman for the 99 ranger the only difference that i had to mod was the crossover pipe that ties everything together to the cats that flange has to be cut off and spun 90 deg and rewelded other than that perfect fit. on the banshee i love the 400cc kit lots more power than before and the more i tune on it the more i get ive got it runing low 9s in a 8th mile before the kit it was runing high 11s
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Old 01-10-2010
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2000 different for headers as well? y pipe off 98-99 work?
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Old 01-10-2010
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motor is the same headers will bolt up the same the y pipe is different on the 98 to 99 model headers you just have to cut the flange off and spin it then reweld it a and works like a charm. a stock y pipe wont work the headers come with a new y pipe
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Old 01-10-2010
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brandon, dont you have a chip or a tuner that gave you a little more power?

imo the easiest thing you can do for power is have the correct gearing for your tire size or even over gear a little bit if you dont do alot of interstate driving
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Old 01-10-2010
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jet chip all i got tuneing wise all that does is mess with timeing
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Old 01-15-2010
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so if i were to cut my flange on my 98 4.0 4x4 what years and manufactures would i be able to substitute in means of the headers? or would the JBAs for a 98 be my only way to go?
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Old 01-15-2010
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jba headers will bolt right up no moding i thank the headman is the ones you got to mod for a 00 ranger they may bolt up to a 98 ranger.
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Old 01-15-2010
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My experience with UD Pulleys was they killed electrical power and dimmed your lights when idling at low rpms when at a red light, with the head lights on and the A/C or defroster running....when you really need them to work. It was ultimately kill your battery and over tax your alternator. I didn't like the idea of raising the idle to compensate for the dimmed lights. If you install an electric fan and UD pulleys the situation will get worse.

For more low end grunt, try raising the timing and a gear change.
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Old 01-16-2010
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anybody have any idea how much hp headers would be worth on a 4.0 ohv? have been told 10-15 hp but i have my doubts about that unless the stock manifold are seriously restrictive- especially on a sub 200hp engine
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Old 01-16-2010
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Quote:
Originally Posted by ringer4x4 View Post
anybody have any idea how much hp headers would be worth on a 4.0 ohv? have been told 10-15 hp but i have my doubts about that unless the stock manifold are seriously restrictive- especially on a sub 200hp engine
you have to remember how much the flow the heads alone restrict on this motor. i think if you were to buy a set of alabama heads and some headers everything would be flowing great and increase maybe 15 hp. ill let yall know when i get mine done
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Old 01-17-2010
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thinking of trying my truck w/o the fan for a couple days to see if any worthwhile improvement.. bought a goodyear quiet belt in my ongoing quest to try and remedy my cold weather squeal- thinking good time to try it- only gotta go about 5 miles to work so lack of fan don't think would hurt it...if helps should change title of thread to headers and efan lol
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Old 04-14-2010
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I have had an efan and noticed a difference (actually noticed it more going back to the standard fan/clutch when the efan croaked). Regarding headers, I have a set of Borla's but would reccomend something else. The quality is great but the primaries are 1-5/8" which is a little large for these engines. I spoke with someone who had dyno'd a pair of 1-5/8's vs. 1-1/2" and noted about 4 more HP in the mid range with the smaller tubes. Now if you have ported heads, cam...it might be another story.
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Old 04-14-2010
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at stuffforyourranger.com they have a kit that includes underdrive and an overdrive for your alternator, so it ends up actually getting more power out of your alt, but im assuiming the would probably kill it faster, so i logically the underdrives would reduce spinning mass. I had a set on my civic, and did notice them, but that was because the thing ran alot higher rpm for peak hp then rangers. When i researched these before they had some really good points, but nothing that really sold me, but i guess if your looking to gain any little pinch of power you can get then go for it, but the kits were running over $400 for a 5 piece kit.
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Old 04-20-2010
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changed my headers... wasn't easy to say the least.. changed my glasspack to a magnaflow at the same time so hard to say which did what but there is an improvement .. though not night and day- probably going to go through same scenario plan on installing an underdrive pulley/ electric fan at same time when i do my timing cover...don't care which makes the improvement as long as there is one
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Old 04-20-2010
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i need to do manifold gaskets on my truck. but im dreading it. how hard was it to get them off on a non bl truck?
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